To return to a previous version of Fishbowl, uninstall the updated version and re-install the previous version. You will need to restore a copy of your old database version that was taken before the update. Any data that was entered into the new version will be lost when you return to the previous version.
WARNING: In some cases a Fishbowl update will make changes to the database that cannot be reversed. Making a backup copy of the database before an update is highly recommended so that the database can be restored to a previous state if necessary.